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PROCEDURE FOR ESTABLISHING A LIST 0 
PERMISSIBLE CARBON MONOXiDE INDICATOR 


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SCHEDULE 18 


DECEMBER 15. 1921 


DEPARTMENT OF THE INTERIOR 

ALBERT B. FALL, SECRETARY 

BUREAU OF MINES 

H. FOSTER BAIN, director 


PROCEDURE FOR ESTABLISHING A LIST OF 
PERMISSIBLE CARBON MONOXIDE INDICATORS 



Fees. Character of Tests, and Conditions 

UNDER WHICH INDICATORS WILL BE TESTED 


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LIBRARY Of rv'y.-o' 

FEB 2 1927 

DOCUMENTS DIVISION 









SCHEDULE 18 


PR OCEDURE K)R ESTABLISHING A LIST OF PERMISSIBLE 
Rj CA RBON MONOXIDE INDICATORS, FEES. CHARACTER 

-C OF TESTS, AND CONDITIONS UNDER TOICH 

INDICATORS WILL BE TESTED 

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CON T ENTS 


Preliminary statement... 

Definition of permissible. . . .;.,. 

Conditions under which indicators will be tested,.*... 

Requirements for Bureau of Mines approval..*. 

Materials. . > ..;..... 

Design and construction.,....* *.. 

Weight and size,... 

Tightness...». 

Time for indications.. 

Gas volumes ........ 

Chemical tests. «... ... 

Minimum carbon monoxide indication...* 

Accuracy of quantitative indications....... 

Tests in artificial light... 

Tests at low temperature..... 

Tests with flue gases..... 

Capacity of absorbent for interfering gases. 

Changes in details of tests.. . ;’V .. v,...... 

Approval plates..... 

Not if ication of manufacturer..v. *...... 

Scope of approval.... 

Withdrawal of approval..... 

Fees for testing carbon monoxide indicators... 

Remittances..... 

Synopsis of procedure to be followed in making applications for tests, 
submitting materials, conducting tests, and notifying applicant of 
resul ts....... 


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PROCEDURE FOR ESTABLISHING A LIST 0? PERMISSIBLE 
CARBON MONOXIDE INDICATORS, 'PRES, CHARACTER 
OF TESTS, AND CONDITIONS TINDER Mr FICH 
INDICATORS ull be tested. 


Preliminary Statement 
Authorization 


An act of Congress (37 Stat., 581) approved February 25, 1913, 
contains the following provision in regard to tests or investigations per¬ 
formed by the Bureau of Mines: 

That for tests or investigations authorized by the Secretary of the 
Interior under the provisions of this act, other than those j^orfcrmed for 
the Government of the United States, or State governments within the United 
States, a reasonable fee covering the necessary expenses shall be charged, 
according to a schedule prepared by the Director of the Bureau of Mines, and 
approved by the Secretary of the Interior, v\ho shall prescribe rules and 
regulations under which such tests or investigations may be made. All moneys 
received from such sources shall be paid into the Treasury to the credit of 
miscellaneous receipts. 

The purpose of this schedule is to establish a list of permissible 
carbon monoxide indicators that are light in weight and portable for quickly 
and easily showing presence of carbon monoxide gas in mine rescue and 
recovery operations; or around blast furnaces, producer-gas and water-gas 
plants, and metallurgical and chemical plants. The permissible indicators 
are to be reliable for indicating dangerous amounts of carbon monoxide in 
air breathed and are to show quantitatively the approximate concentration of 
the carbon monoxide . However, the quantitative indications may in general 
be less dependable than laboratory analyses. 

This schedule is issued for the information and guidance of those 
who may wish to submit such indicators for test. 


Definition of Permissible. 

Permissible, as applied to carbon monoxide indicators, means approved 
by the Bureau of Mines for use in mines, around metallurgical and chemical 
plants, or wherever carbon monoxide hazards may occur. 


Conditions under which Carbon Monoxide Indicators wall be Tested . 

The conditions under which the Bureau of Mines will examine and test 
carbon monoxide indicators to establish their permissibility are as follows: 

(l) The examination and tests will be made at the experiment 
station of the Bureau of Mines at Pittsburgh, Pa. 


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(2) Applications for tests 
Bureau of Mines, Washington, 2. C. } 
description of the indicators to be 
all the details cf construction, and 


shall be addressed to the Director, 
and shall be accompanied by a complete 
tested, a full set of drawings, showing 
statements that are explained in the 


next paragraph. 


The sensitivity of material sensitive to carbon monoxide may vary over 
wide limits, depending on the materials used and the conditions under which 
each lot or batch is manufactured. Hence it will be necessary that each lot 
obtained by a manufacturer be tested before being used for indicators in order 
to obtain the standard set by the Bureau of Mines. For these reasons the 
bureau requires a statement with each application to show the nature, the 
adequacy, and the continuity of such control provided by the applicant. Tests 
for approval will be made only after the bureau is satisfied of the effective¬ 
ness of such control, and approvals once granted will remain in force only 
while the control is sustained. 


(3) A copy of the description, a duplicate set of drawings, a copy of 
the statements concerning the control of the quali ty of the active material 
and two complete indicators identical in every way with those offered for sale 
shall be sent, prepaid, to the Supervising Chemist- Bureau cf Mines, 4800 
Forbes Street, Pittsburgh, Pa. After the event of the apparatus successfully 
passing all of the Bureau 1 s tests and requirements hereinafter specified, one 
set will be retained by the Bureau of Mines and the other will be returned to 
the owner. 


(4) Each indicator shall have marked on it in a distinct manner the 
name of the manufacturer and the name, letter, or number by which the type is 
designated for trade purposes, and a written statement shall be made whether 
or not the apparatus is ready to be marketed, Fo indicator will be tested 
for approval unless it is in the completed form in which it is to be put on 
the market. Tests to assist the manufacturer in the development of the 
indicator may be made at his request and will be charged for in amounts pro¬ 
portionate to the work Involved. 


(5) As soon as possible after the 
test, the manufacturer will be notified of 
will be tested, arid the material that it wi 


receipt of his application for 
the date on which his indicator 
11 be necessary for him to submit. 


(6) All material for test shall be delivered by the manufacturer to 
the Supervising Chemist, Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa., 
not less than one week prior to the date set for the test. 


(7) No one is to be present at these tests except the necessary 
Government officials, their assistants, representatives of the marrufacturer 
of the indicator to be tested, and such other persons as may be mutually 
agreed upon by the manufacturer and the bureau. 


(8) The tests will be made in the order that the applications for 
test are received, provided the necessary material is submitted at the proper 
time. 


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(9) The details of the results of tests shall be regarded as 
confidential by all present at the tests, and shall not be made public in 
any way prior to their official publication by the Bureau of Mines . 

(10) ihe results of tests of the indicators that fail to pass the 
requirements shall not be made public, but shall be kept confidential, 
except that the person submitting the apparatus will be informed with a 
view to remedy of possible defects in future indicators submitted. 

(11) A list of permissible indicators and the results of their tests 
will be made public from time to time by the Bureau of Mines. 


Requirements for Bureau of Mines Approval • 

(1) M aterials . The indicator, all its accessories, and equipment 
must be constructed in all parts of materials suitable for the purpose they 
must serve. This applies to the rubber, metal, glass, chemicals, and other 
parts. Valves must be made of bronze, nickel, brass or other rust proof metal. 

(2) D esign and construction . The excellence of design and mechanical 
construction, as well as the workmanship, will be considered. This will be 
done with regard to safety to users and the accuracy of indications. There 
will also be considered the ease with which temporary parts may be replaced. 

( 3 ) Weight and size . A maximum weight of five pounds for the 
indicator, together with its case containing full equipment is allowable. 

The assembled outfit shall be of a size and shape to allow easy carrying with 
the hand or a shoulder strap. 

(4) Tightness . The instrument will be subjected to pressure and to 
suction, each equal to a column of mercury 15 inches high. No leaks shall 
be permissible at valves or joints and connections. 

(5) Time for indications . The time required for a complete quantita¬ 
tive determination shall not exceed two minutes. 

(6) Gas volumns . The quantity of gas used for an indication may be 
suitable for the particular type of instrument and may be delivered by a 
rubber hand bulb, piston and cylinder, or the like, but variations from the 
average volume per determination shall be within 15 per cent. 

(?) Chemical tests . 

(a) M inimum carbon monoxide indication . The instrument will 
be tested against carbon monoxide in air in steps of 0.01 per cent to deter¬ 
mine the lowest concentration for positive indication. The minimum indication 
will be that at which four out of five competent observers find a positive 
determination. It shall be required for approval that the minimum indication 
shall be not more than 0.08 per cent, and that none of the five observers 
shall fail to find positive indications with 0.10 per cent carbon monoxide. 


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(b) Accuracy of quantitative indications . Quantitative tests will 
be made with carbon monoxide in increasing concentrations, each by five 
independent observers* Following are examples of the concentrations to be 
tested and the tolerances for this and following tests. 


Tolerances for CO content observed. 



TOLERANCES 

Concentration of carbon 
monoxide in air 

Minimum observations 

Maximum 

observations 

Per cent 

Per cent 

Per cent 

0*10 

0.05 

0.20 

0.25 

0.10 

0.50 

0.50 

0.35 

0.90 

1.0 

0.50 

1 .75 

2.0 

1 *0 

More than 2.0 


(c) Tests in a r tificial light . Carbon monoxide in air will be tested 
quantitatively in artificial light. Concentrations of 0.10 and 1*0 per cent 
may be used. For approval, five observers must find concentrations within 
the tolerances stated above. 

(d) Tests at low temperature . Carbon monoxide in air will be tested 
quantitatively while the active material is surrounded by (but separated by 
air from) a bath of ice and water. All the active parts, including the gas 
being tested, will be at the ice water temperature. Concentrations of 0.10 
and 1.0 per cent may be used. For approval two observers must find concentra¬ 
tions within the tolerances stated above. 

(e) Tests with flue gases , (l) A flue gas containing carbon monoxide , 
from a coal burning furnace, will be tested quantitatively. Determinations 

by two observers must come within the tolerances. (2) Dense smoke from a 
smouldering wood fire must give determinations within the tolerances by two 
observers. 

(f) Capacity of absorbent for inter fe ring gases. The activated 
charcoal or other absorbent used for removing interfering gases will be tested 
for capacity by passing hydrogen sulphide through a quantity used to charge 
the indicator. The conditions of the test are these: 

Concentration of hydrogen sulphide in air, 1000 parts per million. 

Humidity, 50 per cent relative humidity. 

Temperature. Boom temperature (approximately 25 C.) 

Rate of flow of gas. 1 liter per minute. 

Tested in this way, the life must be at least 30 minutes. 

The end of the life will be that time at which a solution of starch made blue 
by a trace of iodine is decolorized when a stream of the outgoing gas is bubbled 

through it. 


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Changes in De tails of_ Tests . 

If the mechanical or other features of an indicator render it 
advisable to omit any of the tests or part of a test previously described, or 
to form accessory tests, the bureau reserves the right to modify the test in 
sach manner as to obtain substantially the same information and degree of 
safety as is provided by the tests described. 


Approval Plat es 

The manufacturer will be required to attach to the indicator a plate 
bearing the seal of the Bureau of Mines and inscribed as follows: 


Permissible carbon monoxide indicator. 
Issued for safety, practicability, and efficiency 

to the_company. 

Bureau of Mines Approval No._. 


The requirement of a separate plate will not be made where an equally 
satisfactory inscription can be made by stamping the casing. 

The approval applies only when the indicator has all its parts the 
same as those approved by the bureau. For this reason, the replaceable parts 
shall be packed by the manufacturer in suitable cases or wrappers inscribed 
with the above approval plate, or bearing a suitable paper label. The plate 
may be made a part of the manufacturer's label. One plate or label may apply 
to any number of approval parts within a container. 

The size, material arid design of approval plates or labels shall be 
subject to the approval of the bureau. The manufacturer will be furnished a 
photographic print of the wording and seal to be incorporated in the approval 
plate or label design. 


Notification of Manufacturer 

As soon as the bureau's chemists are satisfied that an indicator is 
permissible, the manufacturers of the indicator and the public-safety depart 
ments of the several states shall be notified to that effect. As soon as a 
manufacturer .receives formal notification that his indicator has passed the 
tests prescribed by the bureau, he shall be free to advertise such an 
indicator as permissible. 


Scope of Approval . 

The bureau's approval of any carbon monoxide indicator shall be 
construed as applying to all indicators made by the same manufacturer that 
have the same construction in all details and have equal chemical qualities 
in the active parts as considered by the bureau. 


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material and the absorbent fo 
manufacturer during the time 


_» chemical control of the 
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quality of the active 
sustained by the 


tnat the approval is operative. 


Withd rawal of Approval 


The Bureau of Mines reserves the rimht to 
tj.me any approval, granted under the conditions as 
indicators or parts may oe purchased on the open m 
Mines and tested, failure to meet the reauirement 
cause for withdrawing the approval granted. 


rescind fcr cause at any 
herein set forth. At times 
arket by the Bureau of 
s for approval will be 


Fees f o r Testing Carbon Monoxide Indicato rs. 

Tne following fees to be charged on and after the date of approval of 
this schedule have been established and approved by the Secretary of the 
Interior. 


Item 1 - Co mplete Te st 


Fo 

including 


r a complete official investigation of 
inspection and tests of the indicator 


carbon monoxide indicator 
... $150.00 


Item 2 - Special char ges 


Preliminary examination . $10.00 

Test for minimum carbon monoxide indication... 20,00 

Accuracy test... 40.00 

Test in artificial light... 10.00 

Test at low temperature. 15.00 

Tests with flue gases.... . 20,00 

Capacity of absorbent for interfering gases... 30,00 


In the event an indicator fails to pass 
the "test in artificial light;", one-half of the 
case the failure occurs after the test in artifi 
will be given. 


tests made during or prior to 
fee will be refunded. In 
cial light is made, no refund 


The fees specified herein are subject to change upon the recommendation 
of the Director of the Bureau of Mines and the approval of the Secretary of 
the Interior. 


Remittances 


Manufacturers who submit carbon monoxide indicators for tests to 
determine their permissibility will be required to furnish certified check or 
bank draft, made payable to the Secretary of the Interior, to cover the fee 
for the tests* Such fee must be received at least two weeks prior to the date 
set for beginning the tests, otherwise the equipment of the next applicant 
upon the list will he nested. 


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1 * Application for tests should be addressed to the Director of the 
Bureau, of Mines, Washington, D.C. This application should be accompanied by 
check or draft, a complete description of the carbon monoxide indicator to be 
testeo., a statement to show the nature, adequacy and continuity of the 
chemical control of the active material and absorbent for interfering gases, 
which is to oe maintained oy the applicant, and a set of drawings described 
in paragraph P a % 9 2 Duplicate copies of the application, descrip¬ 

tion, statements, and drawings should be sent to the Supervising Chemist, 
Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa. accompanied by two com¬ 
plete carbon monoxide indicators. 

2. As soon as the application has been received by the bureau*s 
chemists, the applicant will be notified of the date of the tests and the 
number of indicators or parts it will be necessary for him to submit* 

3. After receiving this notification, the applicant should send the 
material required to the Supervising Chemist, Bureau of Mines, 4800 Forbes St., 
Pittsburgh, Pa. The material should be delivered not less than one week in 
advance of the date set for the beginning of the tests. At this time, the 
applicant should state the name and address of the applicants representative 
who will witness the tests. 

4. The tests will be begun on the date set and continued until the 
carbon monoxide indicator is approved, rejected or withdrawn. 

5. After the bureau's chemist have considered the results of the 
tests, a formal report of the approval or disapproval of the indicator will 
be made to the applicant in writing by the Director of the Bureau of Mines. 

No verbal, report will be made, and the details of the tests must be regarded 
as confidential by all present. 


(Sgd.) S. A. HOLBROOK, Acting Director. 
For H. FOSTER BAIN, Director. 


Approved: Dec. 15, 1921. 

E. C. FINNEY, Acting Secretary of the Interior. 


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